An overland approach from Washington to Richmond. McClellan was terminally convinced that he was outnumbered by the Confederate army. He worried about the prospect of the open field battle that Lincoln's plan sought to bring about. He first planned a riverine movement towards Urbanna, Virginia to outflank the Southern defenses at Manassas, but he took too long to execute the maneuver and found that the enemy army had withdrawn to cover Urbanna. He still did not accept Lincoln's strategy, and instead turned his resources towards an amphibious landing on the eastern tip of Virginia and an advance on Richmond from there. The Peninsula Campaign would prove to be a failure.

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Answer:

An overland approach from Washington to Richmond. McClellan was terminally convinced that he was outnumbered by the Confederate army. He worried about the prospect of the open field battle that Lincoln's plan sought to bring about. He first planned a riverine movement towards Urbanna, Virginia to outflank the Southern defenses at Manassas, but he took too long to execute the maneuver and found that the enemy army had withdrawn to cover Urbanna. He still did not accept Lincoln's strategy, and instead turned his resources towards an amphibious landing on the eastern tip of Virginia and an advance on Richmond from there. The Peninsula Campaign would prove to be a failure.